- Cho Seung-woo
- Â Han Tae Sul 16 episodes, 2021
- Park Shin-hye
- Â Kang Seo Hae 16 episodes, 2021
- Dawn Anderson
- Â Flight Attendant / ... 16 episodes, 2021
- Andrew Lee
- Â Additional voices 16 episodes, 2021
- Lee Hyun Jun
- Â Member of Control Bureau 16 episodes, 2021
- Tae In-ho
- Â Edward 'Eddy' Kim 15 episodes, 2021
- Halley Kim
- Â Kim Seo Jin 14 episodes, 2021
- Sung Dong-il
- Â President Park 14 episodes, 2021
- Jeong Hye-in
- Â Kim Seo Jin 14 episodes, 2021
- Kim Jong-tae
- Â Kang Dong Ki 14 episodes, 2021
- Hao Feng
- Â Choi Jae Sun 12 episodes, 2021
- Chae Jong-hyeop
- Â Choi Jae Sun 12 episodes, 2021
- Choi Jung-woo
- Â Hwang Hyun Seung 12 episodes, 2021
- Jung Ha-Joon
- Â Uhm Seon Ho 12 episodes, 2021
- Kim Byeong-cheol
- Â Sigma 11 episodes, 2021
- Yuuki Luna
- Â Bing Bing 11 episodes, 2021
- Lee Si-woo
- Â Bing Bing 11 episodes, 2021
- Lee Myeong-Ro
- Â Uhm Seon Jae 11 episodes, 2021
- Heo Joon-seok
- Â Han Tae San 10 episodes, 2021
- Go Yoon
- Â Jung Hyeon Gi 10 episodes, 2021
- Young-bin Park
- Â Kwon Hyuk Bum 10 episodes, 2021
- Esther K. Chae
- Â Ma Yong Suk 8 episodes, 2021
- Lim Ji-Sub
- Â Ma Yong Suk 8 episodes, 2021
- Reagan To
- Â Young Seo-Hae 7 episodes, 2021
- Jully Lee
- Â Lee Eun Hee 7 episodes, 2021
- Seo Yi-soo
- Â Kang Seo Hae (young) 7 episodes, 2021
- Lee Yeon-Soo
- Â Lee Eun Hee 7 episodes, 2021
- Yang Joon-mo
- Â Choi Yeon Shik 7 episodes, 2021
- Jeon Gook-hwan
- Â Kim Han Yong 6 episodes, 2021
- Tae Won-suk
- Â Yeo Bong Seon 6 episodes, 2021
- Jung Hyun-jun
- Â Han Tae Sul (young) 5 episodes, 2021
- Min Kim
- Â Sigma Officer 4 episodes, 2021
- Ha Yul-Ri
- Â Choi Go Eun 3 episodes, 2021
- Kim Hie-ryeong
- Â Kim Han Yong's wife 3 episodes, 2021
- Lee Jae-won
- Â Kim Dong-hyeon 2 episodes, 2021
- Lee Joo-won
- Â Seo Won Ju 2 episodes, 2021
- Kim Byeong-chun
- Â Chinese restaurant owner 2 episodes, 2021
- Cha Sung-je
- Â Han Tae San (young) 2 episodes, 2021
- Young-jin Shin
- Â Choi Jae Sun's mother 2 episodes, 2021
- Ian Loh
- Â Bully 1 episode, 2021
- Nick Martineau
- Â Copilot 1 episode, 2021
- Sung Byoung-sook
- Â Jung Hyeon Gi's mother 1 episode, 2021
- Lee Jae-eun
- Â Sun's landlord 1 episode, 2021
- Samantha Daniel
- Â Yu-Rim 1 episode, 2021
- Abraham De Los Santos
- Â Seo Won Ju / ... 1 episode, 2021
- Hwang Dong-joo
- Â Co-pilot 1 episode, 2021
- Roh Haeng-Ha
- Â Flight attendant 1 episode, 2021
- Sang-hee Baek
- Â Jin Hee 1 episode, 2021
- Kim Su-Ha
- Â Kim Jin Hui 1 episode, 2021
